Lake Union (Locale): Sebastian lives on the houseboats here in JADE; Clara parks with Christian here in STAY; Dani and her husband Ian live on the houseboats in HE'S GONE. In ESSENTIAL MAPS FOR THE LOST, Mads discovers the body of Billy Youngwolf Floyd’s mother, Anna, here. Billy lives here with his grandmother on the houseboat docks, too, in ESSENTIAL MAPS FOR THE LOST.Found in: Essential Maps for the Lost, He's Gone, Stay, The Nature of Jade